fix bug where external event dropping would not render the whole-day highlight
fix bug where external event dropping would not render the whole-day highlight

pietervisser/fullcalendar,MeteorAdminz/fullcalendar,MeteorAdminz/fullcalendar,avanti-technologies/fullcalendar,avanti-technologies/fullcalendar,rgnevashev/fullcalendar,deepskyr/fullcalendar,deepskyr/fullcalendar,oleg-babintsev/fullcalendar,deepskyr/fullcalendar,deepskyr/fullcalendar,fullcalendar/fullcalendar,kleisauke/fullcalendar,ouiptik/fullcalendar,pietervisser/fullcalendar,arshaw/fullcalendar,avanti-technologies/fullcalendar,MeteorAdminz/fullcalendar,oleg-babintsev/fullcalendar,blubberly/fullcalendar,ouiptik/fullcalendar,MeteorAdminz/fullcalendar,rgnevashev/fullcalendar,rgnevashev/fullcalendar,oleg-babintsev/fullcalendar,blubberly/fullcalendar,kleisauke/fullcalendar,pietervisser/fullcalendar,laoneo/fullcalendar,laoneo/fullcalendar,avanti-technologies/fullcalendar,blubberly/fullcalendar,fullcalendar/fullcalendar,rgnevashev/fullcalendar,fullcalendar/fullcalendar,arshaw/fullcalendar,arshaw/fullcalendar,blubberly/fullcalendar,fullcalendar/fullcalendar,kleisauke/fullcalendar,ouiptik/fullcalendar,ouiptik/fullcalendar,kleisauke/fullcalendar,laoneo/fullcalendar,arshaw/fullcalendar